Cody Wilson of the company Defense Distributed fired the first gun made of nearly all 3D printed plastic parts earlier this year. That riled both government officials and gun control advocates. Today a Danish company called Create it Real says it has software to help prevent people from creating gun components on their 3D printers.

Jonathan Zittrain, co-founder of Harvard's Berkman Center for Internet & Society, says this news is just the latest in an ongoing debate about downloads and ownership. He joins Marketplace Tech host Ben Johnson to discuss.